We let \(\)  a connected \(k\) -algebraic group and denote its unipotent radical by \({u}{}\) , the \(k\) -points of the unipotent radical will be denoted by \({u}{G}\) .
We recall that the group \(G^+\)  is the subgroup of \(G\)  generated by the unipotent element in \(G\) , see [1]}.
